Coupling metal bars in reinforced concrete.



No. 694,576. Patented Mar. |902.'

E. L. RANSOME. I [NJUPLING METAL BARS !N REINFORCED CONCRETE.

( Application med'm 1a, 1901.]

(No Model.)

Had

IN VENTOR WITNESSES:

UNITED STATES PATENT OFFICE.

ERNEST LEsLIE EANsoME,oE NEW YORK, N. Y.

COUPLING METAL BARS IN REINFORCED CONCRETE. v

SPECIFICATION forming part of Letters Patent N 0. 694,576, dated March 4, 1902. Application filed July 13.1901. Serial No. 68,253; (No model.)

To all whom it may concern:

Be it known that I, ERNEST LESLIE RAN- SOME, a citizen of the United States, residing in the city of New York, State of New York, have invented Improvements in Coupling Metal Bars in Reinforced Concrete; and I hereby declare the following to be a f nll, clear,

and exact description of the same.

My invention relates tothe'couplings used in connecting together the twisted'tensiom bars that are embedded in concrete in order to give added tensional strength thereto. It is also applicable to bars that have not been twisted. Hitherto it has been customary to make such coupling by welding, screwing, hooking, or lapping with long laps. The first is expensive, in many situations impracticable, and generallyis uncertainin result. The

second is also expensive, involving, as it does, upsetting the metal in order to retain the full united together by the concrete or cement grout of the structure, which flows closely about and between the bars and sleeve, entirely embedding them.

i The accompanyingdrawing illustrates my invention, in Which Figure l is a tension-bar about which a loose open sleeve hasfbeen slipped. Fig. 2 is aloose open sleeve in position for slipping over the lap of two tension-bars. Fig. 3 is a loose open sleeve in final position about the lap of two tension-bars. Fig. 4 is a loose open sleeve in final position about a vertical lap. Fig. 5 is a close loose sleeve in final position about a vertical lap.

In carrying out my invention I place one of the bars to be coupled in' its place on the concrete and slip over one end thereof a loose sleeve, as shown in Fig. 1. lapped over the first one, as shown in'Fig. 2, and the sleeve is slipped over the lap, as shown in Fig. 3. The whole is then thoroughly embedded in'the concrete of the structure. By preference the couplingis embedded in a finer and'richer concrete than the balance of the Work. By preference, also, the horizontal couplings are made with open The other bar is as in Fig. 4, or a tube sleeve, as in Fig. 5. It is generally preferable, however, to have the sleeve open enough to allow of a union between the concrete that is without with that which is within the sleeve.

The following couplings will when embedded in concrete give the full strength of the bars coupled, the bars and the wire or rods of the couplings being rectangular and coldtwisted:

Length of lap Coil-sleeve Wu e coils a apart. 1 apart. 1} apart. 1} apart. 1 apart.

A wyn: was

When plain bars are used, the laps will have to be longer.

By the term concrete I include all similar materials that'can be poured or handled in a similar manner, such as grout, plasterof-paris, cast-iron, &c. g

Having thus fully described my invention, what I claim, and desire to secure by' Letters Patent, is-.

1. In reinforced concrete construction a coupling consisting of a lap made by bars and surrounded by a sleeve'large enough to slip over the lap; the whole being fastenedto gether by the concrete in which they are em bedded. I

2. In reinforced concrete construction a coupling consistingof a lap made by bars and surrounded by an'open sleeve large enough to slip over the lap; thewhole beingfastened together by the concrete in which they are embedded.

ERNEST LESLIE RANSOME.

. Witnesses:

JOHN ELLENDT, GEORGE T. ALLEN. 

